Accept Language and Accept Char set in Servlets

This section illustrates you the use of Accept Language and Accept
Char set.

Accept Language and Accept Char set provides a servlets
to determine the
language in which it will speak to the clients. A browser sends the user's
language to the server using the Accept Language HTTP header. The value of the
header specifies the language that the client will receive. The value of an
Accept Language Header will be like: en, ja, de, etc. These indicates the
languages English, Japanese, German respectively. And the client understands the
language.

Each Language consists of q-value. It is an estimate of the user preference for
the language. Default value of q-value is 1.0 which is (maximum). Now the Accept
Language Header with q-value will be: en:q-0.5, ja:q-0.3, de:q-0.7,
etc.

With the Accept Language header, the browser sends Accept
Char set header
which tells the server which char set it understands. Its header value will be
given like: ISO-8859-1, utf-8. The browser understands it. If its value
hasn't sent or it contains *, it means client accepts all char sets. Now this can
be explained with an example.

In the above example, acceptLanguage and acceptCharset are declared as a
variable of string type and passed them to the HTTP header. The browser sends the
language and charset using request.getHeader("Accept-Language"),
request.getHeader("Accept-Charset"). After compilation, run the
tomcat. This will display the language and charset on the browser.